shiny
htmltools
req()
seq()
on.exit()
observe()
isolate
observeEvent
eventReactive
reactiveTimer()
invalidateLater(ms)
git
“Mastering Shiny” is a moving target.
Much of the content for “Layout, themes, HTML” chapter was originally part of the “Basic UI” chapter.
Hence, these notes have greater emphasis on low-level web concerns (html / css / bootstrap)